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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 3 Months Ended
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Mar. 31, 2018
Accounting Policies [Abstract] |
Reconciliation of Weighted-Average Outstanding Shares used in Calculations of Basic and Diluted EPS | A reconciliation of the weighted-average outstanding shares used in the two calculations is as follows:
|  | Three Months Ended March 31,
|  | 2018 |  | 2017
|  | (In millions)
Weighted-average shares outstanding (basic) |  | 120.2 |  |  | 120.0 |
Effect of dilutive securities: |  |  |  |  |
Stock options and restricted stock units |  | 1.1 |  |  | 1.9 |
Weighted-average shares outstanding (diluted) |  | 121.3 |  |  | 121.9 |
Items Measured at Fair Value on Recurring Basis | The following table presents items measured at fair value on a recurring basis:
|  |  |  | Fair Value Measurements at Reporting Date Using:
Description |  | Fair Value of Assets (Liabilities) at March 31, 2018 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
|  | (In millions)
Deferred Compensation Plan Assets(1) |  | $ | 35.3 |  |  | $ | 35.3 |  |  | $ | — |  |  | $ | — |
Deferred Compensation Plan Liability(1) |  | (35.3 | ) |  | — |  |  | (35.3 | ) |  | — |
Total |  | $ | — |  |  | $ | 35.3 |  |  | $ | (35.3 | ) |  | $ | — |
(1) We maintain deferred compensation plans that allow for certain management employees to defer the receipt of compensation (such as salary, incentive compensation and commissions) until a later date based on the terms of the plan. The liability representing benefits accrued for plan participants is valued at the quoted market prices of the participants’ investment elections. The asset consists of mutual funds reflective of the participants’ investment selections and is valued at daily quoted market prices.

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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